Product Installation - Kingspan TR26
Tapered Roofing
Kingspan Thermaroof TR26 is also available in a tapered version, Kingspan Thermataper TT46 , (Priced on Application) comprising a high performance rigid thermoset insulation core, manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), faced on both sides with a low emissivity composite foil facing. Kingspan Thermataper TT46 comes with a supporting design service. This ensures that the most cost-effective solution for a roof is identified and that the end result is a tapered system design which meets a roof's rainwater run-off and insulation requirements.
Further details of Kingspan Thermataper TT46 are available from the Kingspan Insulation Tapered Roofing Department (see rear cover), which should be consulted as early as possible in the process of designing a roof.
Roof Waterproofing
TR26 is suitable for use with most mechanically fixed single-ply waterproofing membranes. Please Note: Kingspan Thermaroof TR26 Is not suitable for use with bitumen based built-up waterproofing systems or mastic asphalt.
Water Vapour Control
TR26 should be installed over a separate vapour control layer, in new build roofs, unless it is being used in conjunction with a sealed metal deck.
Regardless of the deck type it is recommended that a condensation risk analysis is carried out for every project. For refurbishment projects, involving the addition of insulation to existing insulated flat roofs, or roofs constructed of insulated steel faced composite panels, it is imperative that a U Value calculation and condensation risk analysis is carried out for every project, in order to ensure that the correct thickness of insulation is installed to achieve the required thermal performance, whilst avoiding interstitial condensation.
In refurbishment projects, where TR26 is to be installed over an existing bituminous waterproofing membrane, the membrane can be used as a vapour control layer, as long as it is in a good water tight condition. Where this is not the case, a separate vapour control layer should be installed. A minimum separate vapour control layer should consist of a 1000 gauge (250 micron) polythene sheet, with all joints lapped and then sealed with double sided self adhesive tape.
Roof Loading / Traffic
TR26 is suitable for use on access roof decks subject to limited foot traffic. Where inappropriate foot traffic is liable to occur it is recommended that the roof surface is protected by specially constructed walk-ways. For further advice on the acceptability of specific foot traffic regimes, please contact the Kingspan Insulation Technical Service Department (see rear cover).
Green Roofs
TR26 is suitable for use under most green roof systems. Green roof systems are a specialist design area. When designing a loose-laid insulated green roof assembly consideration needs to be given to the following.
Green roof systems are required to have a minimum dry weight of 80 kg/m2 to ballast the insulation boards beneath them.
However, the total required dry weight will depend upon wind uplift, which in turn will vary with the geographical location of the building, local topography, and the height and width of the roof concerned. The necessity for any additional dry weight should be assessed in accordance with BS 6399-2:1997 (Loading for Buildings. Code of practice for wind loads) or BS / I.S. EN 1991 -1 -4: 2005 (National Annex to Eurocode 1 Actions on structures. General Actions. Wind Actions).
When installing a loose-laid insulated green roof assembly, any insulation must be immediately over-laid with the green roof system, which must meet all of the requirements outlined above. Where these requirements cannot be ensured, the insulation must be mechanically fixed.
For further information please contact the Kingspan Insulation Technical Service Department (see below). Lightning Protection Building designers should give consideration to the requirements of BS / I.S. EN 62305: 2006 (Protection against lightning)
Installing over Metal Decks
Where an FM or LPCB approved construction is required, please refer to 'LPCB & FM Certification' on page 13.
Metal decks should be clean, dry, without large
projections, steps or gaps, and should be graded to allow
correct falls to all rainwater outlets.
If using a sealed metal deck there is no requirement for a
separate vapour control layer.
If the metal deck is not sealed the vapour control layer
should be loose-laid.
Where one run of the specified vapour control layer laps
another, there should be minimum 150 mm side and end
overlaps, which should be adequately sealed.
Turn up the vapour control layer at the edge of the roof to a height appropriate to the specified waterproofing
membrane.
Boards of TR26 should
be secured to the deck using mechanical fixings e.g. telescopic tube fasteners
Insulation boards should always be laid break-bonded,
either with their long edges at right angles to the trough openings, or diagonally across the corrugation line, and
with joints lightly butted. There should be no gaps at abutments.
Roof-light or ventilator kerbs etc. should always insulated
with the same thickness of TR26 as the general roof area.
A 25 mm thick TR26
upstand should be used around the perimeter of the roof on the internal fagade of parapets.
A minimum distance of 300 mm should be maintained
between the top of the insulation upstand and the bottom
of the horizontal roof insulation.
The waterproofing membrane is also mechanically fixed in
accordance with the membrane manufacturer's instructions, over the whole insulated area including any
insulation upstands, as soon as possible after laying the
insulation boards.
Installing over Concrete Decks
Concrete decks should be clean, dry, without large projections, steps or gaps, and should be graded to allow
correct falls to all rainwater outlets.
The vapour control layer should be loose-laid over the deck.
Where one run of the specified vapour control layer laps another, there should be minimum 150 mm side and end
overlaps, which should be adequately sealed.
Turn up the vapour control layer at the edge of the roof to a height appropriate to the specified waterproofing
membrane.
Boards of TR26 should be secured to the deck using mechanical fixings e.g. telescopic tube fasteners (see 'Mechanical Fixings').
Insulation boards should always be laid break-bonded, either with their long edges at right angles to the edge of, or diagonally across the roof, and with joints lightly butted. There should be no gaps at abutments.
Roof-light or ventilator kerbs etc. should always insulated with the same thickness of TR26 as the general roof area.
A 25 mm thick TR26 upstand should be used around the perimeter of the roof on the internal fagade of parapets.
A minimum distance of 300 mm should be maintained between the top of the insulation upstand and the bottom of the horizontal roof insulation.
The waterproofing membrane is also mechanically fixed in accordance with the membrane manufacturer's instructions, over the whole insulated area including any insulation upstands, as soon as possible after laying the insulation boards.